I've heard stories of certain medical supply stores that started selling ABDL diapers because they're generally better than medical brands, but they're few and far between with no guarantee to their validity. ABU has a couple warehouses in the US (in Everett, Washington and Baltimore, Maryland) where you can go to directly buy diapers from them, but unless you live close or are able to roadtrip there, that's probably off the table too. You have to order them online and get them shipped to you. Samples aren't free, they cost 6 dollars each and scented is a little extra, but you get 5 dollars off your next order if you get 2 samples.